139585 has 4 divisors (see below), whose sum is σ = 167508. Its totient is φ = 111664.

The previous prime is 139571. The next prime is 139589. The reversal of 139585 is 585931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97969 + 41616 = 313^2 + 204^2 .

It is a cyclic number.

It is not a de Polignac number, because 139585 - 2⁷ = 139457 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13954 + ... + 13963.

It is an arithmetic number, because the mean of its divisors is an integer number (41877).

2¹³⁹⁵⁸⁵ is an apocalyptic number.

It is an amenable number.

139585 is a deficient number, since it is larger than the sum of its proper divisors (27923).

139585 is an equidigital number, since it uses as much as digits as its factorization.

139585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27922.

The product of its digits is 5400, while the sum is 31.

The square root of 139585 is about 373.6107600164. The cubic root of 139585 is about 51.8735834519.

The spelling of 139585 in words is "one hundred thirty-nine thousand, five hundred eighty-five".